package com.itheima.reggie.controller;

import com.itheima.reggie.common.R;
import jdk.nashorn.internal.ir.CallNode;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.util.UUID;

@RestController
@Slf4j
@RequestMapping("/common")
public class CommonController {

    @Value("${reggie.path}")
    private String basePath;
    /**
     * 文件上传
     * @param file
     * @return
     */
    @PostMapping("/upload")
    public R<String> upload(MultipartFile file) throws IOException {
        // file是一个临时文件 启动完成后会被消除
        log.info(file.toString());

        //原始文件名
        String originalFilename = file.getOriginalFilename();
        //获取文件名.jsp .png 字符串
        String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));

        // 使用UUID重新生成文件名，防止文件名重复造成文件覆盖
        String fileName = UUID.randomUUID().toString() + suffix;

        //创建一个目录对象文件
        File dir = new File(basePath);
        if(!dir.exists()) dir.mkdirs();

        file.transferTo(new File(basePath + fileName));

        return R.success(fileName);

    }

    @GetMapping("/download")
    public void download(String name, HttpServletResponse response) throws IOException {

        //输入流 通过输入流读入文件内容
        FileInputStream fileInputStream = new FileInputStream(new File(basePath+name));

        //输出流 通过输出流将文件协会浏览器 在浏览器展示图片
        ServletOutputStream outputStream = response.getOutputStream();

        response.setContentType("imge/jpeg");

        byte[] bytes = new byte[1024];
        int len = 0;
        while((len = fileInputStream.read(bytes)) != -1){
            outputStream.write(bytes,0,len);
            outputStream.flush();
        }
        //关闭资源
        outputStream.close();
        fileInputStream.close();
    }
}
